Surfacing machine



April 20 1926.

J. STURROCK sURFAcING MACHINE Filed Dec. 17, 1925 IN VEN TOR.

1lb/fies H/S ATT NEY Patented Apr. 20, 1926. i'

UNITED STATES PATEN'i` OFFICE. j

-. JAMES STURROCR', OE ATHENS, PENNSYLvANrA, ASSIGNOR To INGERSOLLRANDCOMPANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OE NEW JERSEY.

SUREAoING iirAomNE.l

Application lled December`17, 1925. Serial No. 76,0%.

To all 'whom t may concern:

Be it known that I, JAMES STURROGK, a

lcitizen of the `United. States, 'and a resident of Athens, county ofBradford, and State of Pennsylvania, have invented a certain Sur# Theinvention consists of the combinations of elements, features ofconstruction, and arrangement of partshaving the general yInode ofoperationsubstantially as hereinafter described and more particularlypointed out in the appended claims and illustrated in the accompanyingdrawings, in which- Figure 1 is'an elevation partly in section of apneumatic rotary tool, illustrating the manner in which vwater issupplied throu h the driving spindle of the machine to t e workin faceandthe manner in which relative roc in movement between the drivingspindle an the abradant is obtained, and

Figure 2 is an elevation in section of a head adapted to be attached tothe flexible connection shown in Figure 1 and illustrating the manner inwhich an abrading disk or grinding wheel may be secured thereto`Referring to the drawings, the invention is shown embodied in apneumatic tool indicated generally by A and having a cylinder B to oneend of which is secured a handle C whereb the tool may be manipulated.The tool is of the rotary type and accordingly has a plurality ofpistons (not shown) but the position of two of which are indicated bythe cylinder heads D which may be secured to the main cylinder B by Imeans of screws E. A shaft F which may be connected to the pistons inany suitable manner to be rotated thereby extends through the cylinder Bto a point' near the forward end thereof and carries at its front end apinion G which may be formed separately and secured to the shaft asindicated in the drawings or may be formed. integrally vwith said shaft.v Meshing with the pinion G is a gear H. The gearH is preferablyprovided with a frictionless bearing J which in thisA instance 1sarranged within said gear and cooperates with a stud'K for centralizingthe gear H. Formed integrally with the gear H is a drivin@ spindle Lhaving a' bore O longitudinally through a portion thereof and a smallerpassage P leading from the bore O to the outermost end of saidGspindle.lA front head or casing Q encases the driving splndlc L and is providedwith a iange R at its rearward end which formsv a 'closure for the frontend of the cylinder B.. The bore of the casing Q may be of somewhatlarger diameter than thel diameter of the spindle L .to enable bushingsS to be insertedin the ends of thecasing to provide a .renewable bearingsurface for. said spindles. The casing Q and the spindle L are in thisinstance provided with annular grooves T and U respectively whichcooperate to form an 'annular chamber V between the ends of the bushingsS. v

Although the chamber V is shown in the drawings'as being formed ofcooperating annular grooves in the casing and in the spindle, a singleannular groove of the desired area may, if desired, be formed in either4the casing or the spindle. The chamber V'in this instance.communicateswith the bore O of the spindle L through a plurality of ports WV.Communication between said chamber and a source, of supply of waterunder pressure is afforded by a connectin X screwed in to the side ofthe casing Operatively connected to the, free end of the spindle L is ahead Y preferably of cylindrical form and having a central opening Z. Anannular groove b is formed in the front face of the head YV for thereception of a plurality of burring wheelsc. A convenient means forholding the burring wheels o rotatably in the groove b is shown in theform of' pins d which extend radially through the head and act as shaftsfor said wheels. At one end of the. pins l are formed heads c wherebythe pins d are limited against endwise movement in one direction. Theheads e of the pins d in this instance are provided with semi-circulargrooves f with which an expansible spring ring g may cooperate forholding the pins in operative position.

Means are provided for obtaining a relative rocking movement between thehead Y and the spindle L and for preventing water ejected from thepassage P from being deflected rearwardly toward the position oftheoperator. To this end a pair of flexible. disks i1, are arranged on areduced extension j of the spindle L and are held in spaced relationwith respect to each other by an outer ring or washer c and an innerwasher 0. The outer diameter of the washer o is somewhat smaller thanthe inner diameter of the washer la so that a space p existstherebetween. The area of the space p determines the flexible area ofthe disks h.

Arranged on the outside of the disks h are suitable washers gsubstantially of the same diameter as the washer o and having roundededges as at 1' to prevent chang and cutting of the disks b. The washerg, the disks L, and the spacing washer o may be secured together in anysuitable manner. A convenient method of accom lishing this isillustrated in the drawings, in which the parts are clamped together bymeans of rivets s. However, if desired, bolts or screws may besubstituted for the rivets. The free end of the spindle L is screwthreaded to receive a nut t whereby the disks and the washers may besecurely clamped to the end of the spindle. The disks h may be of anysuitable flexible material, such as rubber, or any equivalentcompositions which possess the `property of impermeability to water orother solvent which may be used for flushing the working face upon whichthe burring wheels are operating.

To the end that the disks h may be firmly secured to the head Y and thatan effective seal may be maintained between the lowermost of said disksand the head, a ring u is arranged on the topmost disk L and is drawndown firmly to compress the edges of the disks la somewhat by means ofscrews 'v which engage the head Y.

Heretofore, there has no provision been made in machines of this typefor supplying water to the working face, as a result the life of theabradant was ofshort duration and considerable discomfort was caused tothe operator due to the presence of dust and the cuttings in theatmosphere. By means of this invention a continuous stream of water maybe at all times supplied to the abradant. The objectionable featureshereinbefore set forth will be eliminated and a greater' elliciency ofthe machine may be obtained. OW- ing to the manner in which the disks 7useal the top portion of the head Y, any water or combination of waterand cuttings which may be deflected from the working face will beprevented from splashing on the drill or on the operator, irres ectiveof the value of the pressure under w ich the water may be supplied.

Referring now to Figure 2, a head w is illustrated having a centralopening corresponding to the central opening Z in the head Y. The head win this instance is provided with an annular flange y of suitable lengthto receive an abrading disk e'. The internal diameter ofthe flange g/ ispreferably somewhat larger than the external diameter' of the disk z topermit a layer of liquefied sulphur 2 or other suitable substance to beintroduced between said flange and the disks for the purpose of securingthe disk z to the head w. Suitable tap holes 3 are formed in a boss 4'of the head w to receive the threaded ends of the screws c whereby thehead fw may be secured to the disks z.

I claim:

1 In a pneumatic tool, the combination of a rotatable spindle, a headadapted to carry an abrading device, and a flexible disk secured at itscenter to the spindle and at its edge to the head for rotating the headand for permitting relative rocking movement between the spindle and thehead.

2. In a pneumatic tool, the combination of a rotatable spindle, diskshaving central openings to engage the spindle, a head adapted to carryan abrading device and secured to the disks, said disks being flexibleto permit relative rocking movement between the spindle and the head,and means for reentorcing the central portion of the disks and forlimiting the flexible area of said disks.

3. In a pneumatic tool, the combination of a. rotatable spindle, alongitudinal bore through the spindle to receive water from a source ofsupply, disks forming a diaphragm and having central openings to engagethe spindle, washers for reenforcing the central portion of the disks, ahead adapted to carry an abrading device and secured to the outer edgesofthe disks, said disks being flexible to permit relative rockingmovement of the spindle and the head, and a passage in the end of thespindle for delivering water from the bore to a working face.

4. In a pneumatic rotary tool, the combination of a rotatable spindlehaving a longitudinal bore, a casing for said spindle having a recess incommunication with a source of water supply, ports in the spindleproviding communication between the bore and the recess, a pair offlexible disks secured directl to the end of the spindle, washerspermitted to rock' with respect to the spindle, for ho ding the disks inspaced relation with said head having a central opening, and a respectto each other, washers for reenforcpassage inthe spindle for deliveringwaterl 10 ing the central portionspof the disks and for through the headto a working face.

5 limiting the `flexible area of the disks, a head In testimony whereofI havev signed `this adapted to car an abrading device andspeclficatlon. l secured to the ldyisks whereby said head is JAMESSTURROCK.

